got this from the US corps of engineers Pittsburg
http://www.lrp.usace.army.mil/nav/nav.htmNavigation Who Uses the Rivers? Why We Need Locks & Dams How Locks & Dams Work Locking Through Navigation Notices Navigation Charts Navigation Links From the days of wooden wicket dams to today's modern technology, improving and maintaining the navigability of our nation's waterways has been a priority for the U.S. Army Corps of Engineers. The Pittsburgh District operates 23 locks & dams on the Allegheny, Monongahela & Ohio Rivers. Locks & Dams Allegheny River Monongahela River Ohio River Lock & Dam 2, Allegheny RiverC.W. Bill Young Lock & DamLock & Dam 4, Allegheny RiverLock & Dam 5, Allegheny RiverLock & Dam 6, Allegheny RiverLock & Dam 7, Allegheny RiverLock & Dam 8, Allegheny RiverLock & Dam 9, Allegheny River Braddock Locks & DamLocks & Dam 3, Mon RiverLocks & Dam 4, Mon RiverMaxwell Locks & DamGrays Landing Lock & DamPoint Marion Lock & DamMorgantown Lock & DamHildebrand Lock & DamOpekiska Lock & Dam Emsworth Locks & DamsDashields Locks & DamMontgomery Locks & DamNew Cumberland Locks & DamPike Island Locks & DamHannibal Locks & Dam Map of Pittsburgh District Locks & DamsWho Uses the Rivers?Navigation systems across the United States and especially in this region significantly contributed to the growth and economic prosperity of our Nation. For centuries settlers in the upper Ohio River basin used the system of rivers in the Pittsburgh region to expand commerce and industrial enterprise. However, it was not until 1824 that Congress tasked the Corps of Engineers with improving navigation on the Ohio River. Dedicated in 1885, Davis Island Lock and Dam, was the first of 53 Ohio River locks and dams, built over a 44 year period, descending from Pittsburgh to Cairo, Illinois.In 1893 the Corps opened a permanent office in Pittsburgh with the mission of improving navigation on the Allegheny and Monongahela Rivers. Today, Pittsburgh District’s navigation system includes 23 locks and dams on the Allegheny, Monongahela and Ohio Rivers. In support of this system, the District also operates a major warehouse and repair facility located on Neville Island, housing a repair fleet responsible for major maintenance work on the locks and dams.Eight locks and dams on the Allegheny River provide 72 miles of slack-water navigation from the Point at Pittsburgh to above East Brady, Pennsylvania. Nine locks and dams on the Monongahela River maintain navigable waters for the entire 128.7 miles of the river from just above Fairmont, West Virginia to the Point at Pittsburgh. Six locks and dams on the Ohio River provide navigable waters from the Point at Pittsburgh for 127.2 miles of the river downstream to New Martinsville, West Virginia. The three rivers that make up the Port of Pittsburgh are used to carry raw materials, bulk and manufactured goods for many industries in the region. The Port of Pittsburgh is the 2nd busiest inland port and the 17th busiest port of any kind in the nationI don't see any reason to not sail on those rivers.